New material
ZFMK 2008.0297, ♀, W1, 25 February 2008; ZFMK 2008.0298, ♂, FC, 7 March 2008; ZFMK 2009.0031, ♂, WSV, 12 December 2008.
Three individuals of this small vespertilionid were captured. Not one was encountered on the 2002 RAP, but two specimens were captured on the 2003 RAP at Mont Béro (Fahr et al., 2006) and one in the Fouta Djallon at Foye (Weber and Fahr, 2007 b). It was reported in the Liberian portion of Mount Nimba at 600 m (Hill, 1982; Wolton et al., 1982). The species was also previously known from Sérédou, Guinea (Ziama; Roche, 1971); it seems to prefer the rainforest zone extending into Guinea savannah and riverine forest (Van Cakenberghe and Happold, 2013 a). It probably roosts in rock crevices, although Eisentraut (1964) also found them roosting in the roof of a house in Bioko. Pipistrellus nanulus was also caught in the Shai Hills of Ghana — a rocky inselberg formation with dry forest thickets surrounded by savannah (Decher et al., 1997). The female caught at W1 on 25 Feb 2008 carried two embryos of 13 mm and one embryo of 8 mm crown-rump length.
Conservation status
Least Concern. Population trend is unknown (IUCN, 2015).